[Analogpoint]

There's many ways of doing something like this. Here are two.

$counter = 0;
foreach ($contactlist as $contact)
{
       ++$counter;
       // output an image

       if (!$counter % 4)
       {
                // start a new row.
       }
}

$contactlistrows = array_chunk($contactlist, 4);
foreach ($contactlistrows as $row)
{
       // start row
       foreach ($row as $cell)
       {
                // print cell
       }
       // finish row
}